sash window(n = noun.artifact) - a window with (usually two) sashes that slide vertically to let in air;
is a kind of window
bay window, bow window, car window, casement window, display window, dormer window, double-hung window, french window, lancet window, louvered window, oriel window, oval window, picture window, pivoting window, rear window, rose window, round window, sash, sash cord, sash fastener, sash line, sash lock, sash weight, show window, sliding window, stained-glass window, storm sash, storm window, ticket window, transom window, window, window blind, window box, window cleaner, window dresser, window dressing, window envelope, window frame, window glass, window lock, window oyster, window pane, window sash, window screen, window seat, window shade, window shopping, window trimmer, window washer